Srimad Bhagavad Gita (Hard) By Srila Bhaktivinoda Thakura

The living entities are eternal. Therefore, their propensities are eternal and their activities are also eternal. The activities of the conditioned souls are materially designated and the activities of the liberated souls are transcendental. And, all the activities of those who have never been conditioned by matter or who have become freed from the influence of matter are purely transcendental. The pure activities of the pure spirit souls are called bhakti, and the mundane activities of the conditioned souls are called karma. As long as the living entities remain in the conditioned stage, they will have to perform karma. The constitutional function of the living entities is to love the Supreme Lord. This is their natural propensity.
Translated by Bhumipati Das